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贴片直插SN74LS280DG/SN74LS260DG/SN74LS253MG/SN74LS257BN/4
贴片直插SN74LS253NG/SN74LS251DG/SN74LS245HG/SN74LS247NG/4
贴片直插SN74LS253DG/SN74LS257BM/SN74LS273FN/SN74LS259NG/4
全新原装 SN74LS253DG4 SN74LS253DE4 SN74LS253D SN74LS251NSR
全新SN74LS253DG4 SN74LS251NSR SN74LS251DR2 SN74LS249NTI
